20 min on "Level 6" on a stair stepper with 60lbs in the Kifaru
A step mill? Looks like an escalator? You'll find out if you have any knee issues doing that loaded. Level 10 unweighted (or lightly so) would be a wiser approach.
That's the one. I've got pretty dang healthy knees (knock on wood) and have found this to be about as close as I could find to hiking a mountain without actually hiking a mountain. It's a quad and lung burner and I've seen it benefit me a ton in the field....
